The Tenneco 09805000 01 Dosing Control Unit is a premium automotive electronic control module engineered specifically for Selective Catalytic Reduction (SCR) systems. Designed to precisely manage the injection of diesel exhaust fluid (DEF), this unit is essential for reducing harmful NOx emissions in modern diesel engines and maintaining strict environmental compliance. It features a highly robust black plastic housing built to withstand harsh under-hood automotive environments, complete with a secure large multi-pin electrical connector for reliable data transmission. Equipped with multiple integrated fluid ports and nozzles for efficient liquid handling, this genuine Tenneco component ensures optimal emissions control, seamless system integration, and long-lasting durability.